Chambering attachment for rock-drills.



J. B. WORD. OHAMBBRING ATTACHMENT FOR ROCK DRILLS.

' APPLIoATloN FILED Amas, 1912.

1,061,271 O. Patented May, 1913. 2 SHEETS-SHEET l.

J. B. WORD.

OHAMBERING ATTACHMENT FOR ROOK DRILLS. APPLIoATIoN PILEDAPms. 1012.

1,061,210. Patented May 6, 1913.

2 SHEETS-SHEET 2. 17 L3. 6.

WITNESSES sTaTns PATENT ernten.

JOHN B. WORD, OF LATROBE, CALIFORNIA, ASSIGNOR OF ONE-HALF TO WILLIAM F. DEANER, OF AMADOR CITY, CALIFORNIA.

Specification of Letters Patent.

Patented May 6, 1913.

Application filed April 5, 1912. Serial No. 688,589.

To all whom t may concern.'

Be it known that I, JOHN B. Worn, a citizen of the United States, residing at Latrobe, in the county of Eldorado and State of California, have invented certain new and useful Improvements in Chambering Attachments for Rock-Drills', of which the following is a specication.

My invention relates to the class ot' rockdrills and especially to an attachment therefor the purpose ot which is to enlarge the previously made drill-hole at any point or points desired to provide a distinct chamber or chambers for the reception oft the blasting powder.

A further purpose oit the attachment is to straighten out what is termed a issured hole; that is, one which, on account oit a weakness in the rock, due to a fissure, starts to get out of line or bend.

My invention consists in the novel construction and arrangement of the attachment which I shall now fully describe, by reference to the accompanying drawings, in which- Figure l is an elevation oit my attachment, the bit-holder being broken away on one side to show the bits and plunger-head. Fig. 2 is an enlarged detail View oi the bit holder, one side and onebit being removed. Fig. 3 is an edge view, enlarged, oit the bit holder. Fig. 1t is a broken detail enlarged of a bit holder provided with an arrangement of bits adapted for straightening out a iissured hole. Fig. 5 is a horizontal section of the frame bearing for the plungersleeve. Fig. G is a view showing the application of my attachment to a rock-drill.

The frame of the attachment is composed of two side arms 1 and two front cross pieces 2, the overlapping portions of which are detachably connected by bolts 3, and'embody the bearing 4 for the plunger-sleeve 5, said plunger sleeve being rotatably mounted in said bearing Ll, and held against lengthwise movement therein by a collar 6 fast upon said sleeve and confined in a slot 7 in the bearing.

Mounted and adapted to be lineally recip- The head 9 of the plunger is flattened out and presents for its Yfunctional portion a double incline-plane or taper, the faces of which are for its best operation made concave as shown. The end oit the plungersleeve 5 in which the head of the plungerlies and operates is open on each side, as shown at 10, and is somewhat flattened so that while the plunger head can freely move back and forth, it cannot turn on its axis in said sleeve end, from which it follows that any rotary movement given to the plunger will through its head 9 effect the rotary movement oi the sleeve 5 also, said sleeve turning in its bearing Ll of the frame. This opensided end ot' the plunger-sleeve constitutes what I may term, the bit-holder, and I have herein designated it by 11. It may be of any suitable character for carrying the pivotally connected bits or cutters. In its best construction ttor chambering work, it consists of the two sides, a cross-pin 12 between their extremities and internal stop-lugs 13 and 13', the relative arrangement and function ot which I shall presently describe.

The cutting bits may be of various kinds with respect to their vfunctional surfaces or cutting portions. For example, I have shown one, 14, as having a double cross cutting edge, and another, 15, as having a single longitudinal cutting edge. Two bits like 14: may be used together in the bit-holder; or two like 15; or, as I have here shown, in Fig. 1, for the sake of simplicity, one like 14 may be used on one side and one like l5 on the other side. These arrangements are matters of selection to be made from a knowledge of the character of the rock or the condition of the drill hole, and it follows that other forms of bits may also be used. The bits are made so that they may be readily fitted to and easily removed from the bit-holder. In the present case, each bit is formed with a halved-out ear 1G provided with an open ended slot 17, adapted to fit angle, a position it cannot assume when 1n or under operat-ion in the drill hole. Thus the bit can be readily pivotally fitted in an extended position upon the cross-pin in the first place, and then turned down to lie within the open-sided bit holder in which position and in the slight angular posit-ion to which it is thrown outward in actual operation, it cannot disengage itself from the cross-pin, as is plainly evident vby reference to Fig. 2. One bit isfitted to the bit-holder on one side, and the other bit is ittedto the other side, and when ready for use they lie beside one another and play in the open sides of the bit-holder. Each bit has a rounded or beveled inner edge 18 for the taper-front of the plunger-head 9 to act against as it enters between the pair of bits.

I have herein shown Iin Fig. 6 a rockdrill with which my attachment is to be used. This is a well known machine, having a body 24 which carries a drill-chuck 25, to which a rapidreciprocating motion is imparted; at the same time an intermittent rotation on its axis being given to it.

19 are the side or tie-rods of t-he drill machine body which hold the heads together. The fo-rward extremities of these rods 19 which are sho-Wn clearly in Fig. `1 I modify to the extent of forming them with eyes 20 to receive the pins 21 of the rear ends of the side arms 1 of the frame of my attachment, whereby said frame is thus connected easily to the drill machine-body- The operation of my attachment is as follpws:-\Vhen the drill-hole is made and ready for the powder, the drill is removed from the chuck of the machine. Then my attachment is fitted to the ends 19 of the side or tie-rods of the drill machine, and the inner end of the plunger 8 is inserted and clamped in the drill-chuck as shown in Fig. 6. The proper cutting bits `being fitted to place in the bit-holder 11, said holder is inserted in the drill hole to the distance desired. Then the drilling machine is start-ed, and the plunger 8 is given a rapid forcible recipr'ocation, whereby its taper-head 9 acting on and between the beveled inner edges 18 of the cutting bits forces said bits out to cause them to give -a series of blows against t-he walls of the hole. The chuck having its usual intermittent rotation, effects a like rotation ofthe plunger 8, -and said plunger through its confined head 9 causes the rotation of the plunger-sleeve 5 in its bearing 4, and the consequent rotation of the'cutting bits in the bit-holder 11. This operation is continued to the limit of effect of the taper front of the plunger in the bits, and the drill hole is thus chambered or enlarged for the reception of the powder, in some cases, the drill-hole, due to a fissure in the rock orv for other causes, bends or deflects from a straight line and must either be abandoned or various expedients resorted to, such as cramming into its inner end foreign substances or bodies, such as nuts or other pieces of metal, whichexpedients are not valways successful. In the case of a issured hole,

` as it is called, I provide for the use of my attachment, by modifying slightly the bits and their position in the holder, so that said bits may cut right up to the very end or bend of the hole and byachambering or enlarging effect at that point provide for the straightening of the hole and the continuation of drilling. I show this modification in Fig. 4, wherein in the bit-holder are the cutting bits 22, having their cutting faces at the end of the holder, said bits being pivotally mounted on a pin 23 between their extremities. This arrangement enables Ithe work to be done right up to the end or bend of the hole.

Having thus described my invention what I claim as new and desire to secure by Letters Patent is- 1. A chambering attachment for rockdrills comprising a frame adaptedvfor connection with the rock-drill body; a plungersleeve rotatably mounted in said frame; cutting bits movably mounted in the forward end of said plunger-sleeve; a plunger mounted to slide lengthwise in said sleeve and having its rear end projecting therefrom for engagement with the rock-drill chuck; a head on the other end of the plunger adapted by contact with the cutting-bits to effect their operation; and means for locking the plunger sleeve against independent rotation on their axes.

2. A chambering attachment for rockdrills comprising a frame consisting of a pair of side arms having at their rear ends means for detachably connecting them with the rock-drill body, and front cross arms with which the forward ends of the side arms are connected, said cross arms having overlapping ends and a bearing formed between said ends; a plunger-sleeve rotatably mounted in said cross-arm bearing and locked aga-inst endwise movement therein by a collar fitted in a slot in said bearing; cutting bits movably mounted in the forward end of said plunger-sleeve; a plunger mounted to slide'lengthwise in said sleeve and having its rear end project-ing therefrom for In testimony whereof I have signed my engagement with the rock-drill chuck; a name to this specification in the presence of head on the other end of the plunger adapttwo subscribing Witnesses.

ed by Contact With the cutting-bits to effect JOHN B. WORD. 5 their operation; and means for looking the Witnesses:

plunger and sleeve against independent ro- OSCAR L. SWINGLE,

tation on their axes. P. A. GHozmzvnA.

Copies of this patent may be obtained for ve cents each, by addressing the Commissioner of Patents, Washington, D. C. 

